After using
311 of her flour, Mrs Heng bought another 12 kg of flour. As a result, Mrs Heng now has
1211 as much flour as what she had at first. How many kilograms of flour did Mrs Heng have at first?
| |
Flour |
Total |
| Before |
11 u |
11 u |
| Change 1 |
- 1 u |
|
| After 1 |
8 u |
|
| Change 2 |
+ 12 |
|
| After 2 |
8 u + 12 |
12 u |
Fraction of flour left after using
311 of it
= 1 -
311 =
811 Amount of flour left after using some = 8 u
Amount of flour after buying 12 kg of flour = 8 u + 12
8 u + 12 = 12 u
12 u - 8 u = 12
4 u = 12
1 u = 12 ÷ 4 = 3
Amount of flour that Mrs Heng had at first
= 11 u
= 11 x 3
= 33 kg
Answer(s): 33 kg
